build.rs

use std::error::Error;
use vergen_gitcl::{Emitter, GitclBuilder};

fn main() -> Result<(), Box<dyn Error>> {
    // Try to get the git sha from the local git repository
    match GitclBuilder::all_git() {
        Ok(gitcl) => match Emitter::default().fail_on_error().add_instructions(&gitcl) {
            Ok(emitter) => {
                if emitter.emit().is_err() {
                    fallback_git_sha();
                }
            }
            Err(_) => {
                fallback_git_sha();
            }
        },
        Err(_) => {
            fallback_git_sha();
        }
    };
    Ok(())
}

fn fallback_git_sha() {
    // Unable to get the git sha
    if let Ok(sha) = std::env::var("GIT_SHA") {
        // Set it from an env var
        println!("cargo:rustc-env=VERGEN_GIT_SHA={sha}");
    }
}